The decay curves for Auger-free luminescence from BaF_2 and CsC_1 crystals excited by vuv photons and high-energy electrons from 511 keV annihilation radiation have been measured. The existence of a fast luminescence component under vuu photon excitation suggests some unknown relaxation process for the outermost-core holes which are produced in the order of 100A cm form the crystal surface. A non-exponential decay for a time decay of the Auger-free luminescence from BaF_2 crystal under vuv-photon excitation is explained by the surface quenching and the energy transfer to the excitations produced by the same photon. A strong anticorrelation between photoelectric yield spectra of BaF_2 and SrF_2 under vuv photon excitation between Auger-free luminescence yield has been observed.今後の研究としては最外内殻ホールの結晶内拡散と表面非放射過程を考慮した発光の時間変化と光励起スペクトルの理論的解明の発展が望まれる。